#include<string.h>
#include<assert.h>
int my_strcmp(const char arr1[30],const char arr2[30]);
char* my_strcat(char arr1[30],const char arr2[30]);
char* my_strncat(char arr1[30],char arr2[30],int con);
int my_strncmp(const char arr1[30],const char arr2[30],int con);
void* my_strstr(const char arr1[30],const char arr2[30]);
void* my_memcpy(void* arr1,void* arr2,int size);
void* my_memmove(void* arr1,void* arr2,int size);